The design of the hub assembly of the front wheel
1 - Hub
2 - Polyurethane sealing ring
3 - Tapered roller bearing
1. Remove the hub (1) (see Section Removal and installation of naves of forward wheels).
2. Remove the tapered roller bearing from the hub stub (3).
3. Remove the polyurethane O-ring (2), - must be replaced without fail.
4. Installation is in reverse order, do not forget to lubricate the NEW polyurethane ring before installation (2) and bearing (3). Also pack about 80 grams of multipurpose grease into the cavity in the pivot housing between the tapered roller bearings.